Results 81 to 90 of about 101,444 (317)

Ruthenium-Based Heterocyclic Carbene-Coordinated Olefin Metathesis Catalysts [PDF]

, 2010
The fascinating story of olefin (or alkene) metathesis (eq 1) began almost five decades ago, when Anderson and Merckling reported the first carbon-carbon double-bond rearrangement reaction in the titanium-catalyzed polymerization of norbornene.
Grubbs, Robert H., Vougioukalakis, Georgios C.   +1 more
core   +1 more source

Donor substituted sulfonyl carbenes, 2: Organothio sulfonyl carbenes [PDF]

Tetrahedron, 1994
Abstract Organothio sulfonyl carbenes 3 have been generated via ylid thermolysis or via α-elimination starting from α-chloro α-organothio sulfones and their derivatives. They have been captured by suitable nucleophilic tapping reagents (diazomethane, enol ethers, and others).
Schank, Kurt, Abdel Wahab, Aboel Magd A., Bügler, Stephan, Eigen, Peter, Jager, Jürgen, Jost, Klaus   +5 more
openaire   +1 more source

Alkinyltriazene in photochemischen metallfreien Doyle‐Kirmse‐Umlagerungen

Angewandte Chemie, EarlyView.
Es wird eine metall‐ und additivfreie photokatalytische Doyle‐Kirmse‐Reaktion von Alkinyltriazenen beschrieben, die über Cyancarbenzwischenstufen verläuft. Diese Strategie ermöglicht den effizienten Aufbau hochsubstituierter asymmetrischer Kohlenstoffzentren mit breitem Substratspektrum und liefert synthetisch wertvolle Nitrile.
Ningning Liu, Linus Bjarne Dittmer, Melina Maag, Elena Michel, Frank Rominger, Matthias Rudolph, Andreas Dreuw, A. Stephen K. Hashmi   +7 more
wiley   +1 more source

Dirhodium‐Catalyzed Enantioselective Synthesis of Difluoromethylated Cyclopropanes via Enyne Cycloisomerization

Advanced Science
(Difluoromethylated cyclopropane represents an important motif, which is widely found in bioactive and functional molecules. Despite significant progress in modern chemistry, the atom‐economic and enantioselective synthesis of difluoromethylated ...
Chuntao Wang, Dong Zhu, Rui Wu, Shifa Zhu   +3 more
doaj   +1 more source

Polycondensation of Hexamethylenetetramine in Anhydrous Acid Media as a New Approach to Carbyne-Like Materials and Its Application as Dispersant of Carbon Materials

C, 2019
Aminocumulene (AC), a technical name that results from the hexamethylenetetramine polycondensation in anhydrous sulfuric acid, was successfully performed toward the synthesis of oligomeric cumulenic compounds made up of carbyne-like (=C=C)x fragments as ...
Alyona V. Gerasimova, Olga V. Alekhina, Leticia García-Cruz, Jesús Iniesta, Alexander V. Melezhik, Aleksey G. Tkachev   +5 more
doaj   +1 more source

Half-Sandwich Ir(III) and Os(II) Complexes of Pyridyl-Mesoionic Carbenes as Potential Anticancer Agents [PDF]

, 2019
A series of cationic chlorido arene-iridium(III) and arene-osmium(II) complexes with bidentate pyridyl functionalized mesoionic carbenes (MIC) of the 1,2,3-triazol-5-ylidene type have been prepared.
Bolje, Aljoša, Brozović, Anamaria, Gržan, Tena, Hohloch, Stephan, Košmrlj, Janez, Kralj, Juran, Osmak, Maja, Sarkar, Biprajit, Steiner, Ivana, Stojanović, Nikolina, Stupin Polančec, Darija, Tupek, Ana, Urankar, Damijana   +12 more
core   +1 more source

Ru-Catalyzed, cis-Selective Living Ring-Opening Metathesis Polymerization of Various Monomers, Including a Dendronized Macromonomer, and Implications to Enhanced Shear Stability [PDF]

, 2020
An unsaturated polymer’s cis/trans-olefin content has a significant influence on its properties. For polymers obtained by ring-opening metathesis polymerization (ROMP), the cis/trans-olefin content can be tuned by using specific catalysts.
Ahmed, Tonia S., Bang, Ki-Taek, Choi, Tae-Lim, Grubbs, Robert H., Peterson, Gregory I., Song, Jung-Ah, Sung, Jong-Chan   +6 more
core  

Probing the C-H Activation of Linear and Cyclic Ethers at (PNP)Ir [PDF]

, 2009
Interaction of the amido/bis(phosphine)-supported (PNP)Ir fragment with a series of linear and cyclic ethers is shown to afford, depending on substrate, products of α,α-dehydrogenation (carbenes), α,β-dehydrogenation (vinyl ethers), or decarbonylation ...
Chen, Chun-Hsing, Foxman, Bruce M., Grubbs, Robert H., Ozerov, Oleg V., Timpa, Samuel D., Whited, Matthew T., Zhu, Yanjun   +6 more
core   +1 more source

Crystal structure of (η4-cyclooctadiene)(3,3′-dimesityl-1,1′-methylenediimidazoline-2,2′-diylidene)nickel(0) tetrahydrofuran monosolvate

Acta Crystallographica Section E: Crystallographic Communications, 2018
The crystal structure of the title compound, [Ni(C25H28N4)(C8H12)]·C4H8O or (MesNHC2Me)Ni(COD), which contains a bidentate N-heterocyclic carbene (NHC) ligand with mesityl aryl groups is reported.
Carlos D. Yamamoto, Zijie Zhang, Sabine Chantal E. Stieber   +2 more
doaj   +1 more source

Iron-disilyl-complex-induced activation of carbonyl compounds in the deoxygenative formation of iron-carbene complexes

Communications Chemistry
Even though transition-metal-carbene complexes occupy an important position in modern materials science, many synthetic methods for the synthesis of transition-metal carbenes rely on the use of diazomethane reagents or the incorporation of alkyl ligands ...
Yuto Suga, Yusuke Sunada
doaj   +1 more source